[exim] exim 4.69 + dkim build error

While trying to build exim 4.69 with libdkim (1.0.15) support, I'm
getting the following error:

gcc -o eximon.bin
util-spool_in.o: In function `spool_read_header':
/usr/src/redhat/BUILD/exim-4.69/build-Linux-armv5tel/spool_in.c:752: undefined reference to `dkim_do_verify'

(libdkim is installed in /usr/lib, dkim.h in /usr/include, and I added
EXPERIMENTAL_DKIM=yes
LDFLAGS += -ldkim -lssl -lstdc++
to Local/Makefile.)

It seems dkim_do_verify is only declared in globals.c, but that file isn't
build/linked for eximon.

Are patches required for exim 4.69 to support dkim?

--
Russell King